. Elements of agriculture; a text book for public schools. Agriculture. WEEDS. 99 It would probably pay to pull it, even when it is abundant. If clean seed grain is sown, the weed can easily be eradicated, provided a good system of rotation is followed. (8) Tumbling Mustard. This weed, sometimes called white mustard, is most abundant in the light- er soils of the state. In the flax fields of the central portion of North Dakota it seems to take almost complete possession. The flowers are nearly white or faint yellow in color. The leaves are oblong in shape, and cut-toothed. The pods are long an
. Elements of agriculture; a text book for public schools. Agriculture. WEEDS. 99 It would probably pay to pull it, even when it is abundant. If clean seed grain is sown, the weed can easily be eradicated, provided a good system of rotation is followed. (8) Tumbling Mustard. This weed, sometimes called white mustard, is most abundant in the light- er soils of the state. In the flax fields of the central portion of North Dakota it seems to take almost complete possession. The flowers are nearly white or faint yellow in color. The leaves are oblong in shape, and cut-toothed. The pods are long and very slender, and may contain over one hundred seeds. The seeds vary in color from reddish yellow to yellowish green, and are the size of a naked timothy seed. The plants become very bushy if al- lowed room to develop. They die in September, after the hard frosts, and, breaking loose from the ground, they are rolled hither and thither by the wind. The seeds are not easily released from the pod, and so much rolling and pounding is required to distribute them. One plant may develop 1,500,000 seeds, which would seed five acres, allowing seven seeds to the square foot. The large "tumblers" that form in waste places should be destroyed. The This figure illus- a seedling plant of destructive weed known as Tumbling Mus- tard. Many annual plants such as tumbling mustard and pennycress produce seedlings in the fall of the year, which are not killed by the freezing of winter. These grow rapidly and do great damage the following spring, if not Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Shepperd, J[ohn] H. [from old catalog]; McDowell, John Chambers, 1867- [from old catalog] joint author. St. Paul, Minn. , Webb publishing company
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